SuperTuxKart 1.5 upstream source (from official release tarball)

2026-06-11 20:04:02 +02:00
commit 2957e51aaa
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+// Using numerical value from here
+// http://content.gpwiki.org/index.php/D3DBook:High-Dynamic_Range_Rendering
+
+vec3 getCIEYxy(vec3 rgbColor)
+{
+    mat3 RGB2XYZ = transpose(mat3(
+        vec3(.4125, .2126, .0193),
+        vec3(.3576, .7152, .1192),
+        vec3(.1805, .0722, .9505)));
+
+    vec3 xYz = RGB2XYZ * rgbColor;
+    float tmp = max(xYz.x + xYz.y + xYz.z, 0.1);
+    return vec3(xYz.y, xYz.xy / tmp);
+}